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A215054 as a simple table

na(n)
121
137
1433
15124
16397
171125
182893
196871
2015269
2132065
2264130
23122916
24226922
25405218
26702378
271185263
281952198
293145208
304966118
317697483
3211729498
3317594247
3426008887
3537929627
3654618663
3777726559
38109392935
39152368731
40210163767
41287223815
42389141943

[1,7,33,124,397,1125,2893,6871,15269,32065,64130,
 122916,226922,405218,702378,1185263,1952198,
 3145208,4966118,7697483,11729498,17594247,
 26008887,37929627,54618663,77726559,109392935,
 152368731,210163767,287223815,389141943]